sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, typically tan, brown, yellow, or red with a dull or earthy luster, composed mainly of quartz grains.
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Physical properties
Hardness of 6-7 on Mohs scale, typically tan, brown, yellow, or red with a dull or earthy luster, composed mainly of quartz grains.
Formation & geological history
Formed through the accumulation, compaction, and cementation of mineral particles or rock fragments, usually in desert, river, or beach environments over millions of years.
Uses & applications
Widely used in construction as a building and paving material, and in glassmaking due to its high silica content.
Geological facts
Sandstone formations often display prominent cross-bedding and layers that record ancient wind or water current directions.
Field identification & locations
Identified by its gritty texture and visible sand grains; commonly found in deserts, canyons, and mountainous sedimentary regions worldwide.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary